fig2

Figure 2. (A) SEM image of SrAl₁₂O₁₉:2%Cr³⁺ sample; (B-G) SEM image and element mappings of SrAl₁₂O₁₉:2%Cr³⁺, 1%Nd³⁺ sample; (H) High-resolution TEM image of SrAl₁₂O₁₉:2%Cr³⁺; (I) Fourier transform image of the selected region for SrAl₁₂O₁₉:2%Cr³⁺; (J) Selected area electron diffraction image of SrAl₁₂O₁₉:2%Cr³⁺. SEM: Scanning electron microscope; TEM: transmission electron microscopy.